Abstract Polymer latexes are often found to retard cement hydration. Interaction of polymer particles with Ca2+ in pore solution and adsorption of polymer on cement were proposed as possible mechanisms for the retardation effect. This paper aims at disclosing the retardation mechanism of colloidal polymers using a highly carboxylated polystyrene latex. Interaction between colloidal particles and Ca2+ was studied by post-treatment of the latex with Ca(NO3)2. Techniques including calorimetry, adsorption test, ICP-OES, SEM, are involved to investigate effects of the post-treated latexes on hydrations of cement and C3S. It is found that enrichment of Ca2+ on surface of colloidal particles doesn't contribute to the retardation effect of polymer on cement hydration. Furthermore, the acceleration effect of the two-step treated latex using Ca(NO3)2 and Na2SiO3 suggests that nucleation inhibition of the adsorbed polymer layer on cement surface is the more conceivable mechanism responsible for the retardation effect of the highly carboxylated latex.

中文翻译：

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高度羧化胶体聚合物对水泥水化和与钙离子相互作用的影响

摘要 聚合物胶乳经常被发现会延迟水泥水化。聚合物颗粒与孔隙溶液中 Ca2+ 的相互作用和聚合物在水泥上的吸附被认为是缓凝效果的可能机制。本文旨在揭示使用高度羧化聚苯乙烯胶乳的胶体聚合物的阻滞机制。通过用 Ca(NO3)2 对胶乳进行后处理来研究胶体颗粒和 Ca2+ 之间的相互作用。采用量热法、吸附试验、ICP-OES、SEM等技术研究后处理乳胶对水泥和C3S水化作用的影响。发现胶体颗粒表面Ca2+的富集对聚合物对水泥水化的延缓作用没有贡献。此外，